Sienna's Zany Day at the Zoo

Sienna Miller enjoys an outing at the London Zoo on Tuesday with her family, including her mom Jo Miller.

The kids accompanying Sienna presumably belong to her sister, Savannah, with whom she’s launching a fashion line, Twenty8Twelve, this September in London. Sienna also has two half-brothers, Charles and Stephen and a step-sister, Natasha.

Other pictures include Sienna the day after during a break on the film set of her new movie Best Times of Our Lives in North London.

15+ pictures inside of Sienna‘s day at the zoo…